CVE-2026-79680 Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module
Attackers can bypass password authentication in Qt VNC Server using a modified client to gain unauthorized remote access to shared applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-79680?
CVE-2026-79680 is a medium-severity authentication bypass vulnerability in qt, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared application, compromising the confidentiality and integrity of the session.
Weakness: CWE-288
Which versions are affected by CVE-2026-79680?
How do I fix CVE-2026-79680?
No fix has been published for CVE-2026-79680 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-79680 being exploited?
There is no known exploitation of CVE-2026-79680 in the wild and no public exploit code.
Sources
Also known as GHSA-wc8f-vjgx-jxrw.